Boyu · UV clarifier
Submersible UV Steriliser
- UV lamp
- 4–20 W
Knocking out a green water bloom or running in a sump on a larger system.
6 models
Eheim · UV clarifier
Eheim reeflexUV
reeflexUV is an inline UV clarifier that goes on your canister's return hose. A reflector inside bounces the UV back through the water, so it gets more done per watt than a plain unit, and it kills free-floating algae that turns water green.
Updated
7–11 W3 models
Will it suit my tank?
litres
Best for
Planted tanks prone to green water, or anyone wanting a bit of extra clarity and pathogen control.
Worth knowing
It does nothing for algae growing on plants or glass, and the lamp needs replacing about once a year.
What stands out
- Fits inline on the filter return
- Internal reflector boosts effective UV dose
- Clears green water from suspended algae
- Three sizes to match tank volume and filter flow
Models and specs
| Model | Tank size | UV lamp | Power | Flow range | Hose size | Dimensions |
|---|---|---|---|---|---|---|
| 350 | 80–350 L | 7 W | 9 W | 200 to 400 L/h | 12/16 mm | 13 x 35 x 11.5 cm |
| 500 | 300–500 L | 9 W | 10 W | 400 to 800 L/h | 16/22 mm | 13 x 38 x 11.5 cm |
| 800 | 400–800 L | 11 W | 13 W | 600 to 1200 L/h | 16/22 mm | 13 x 50 x 11.5 cm |
- Brand
- Eheim
- Max pressure
- 0.8 bar
- Water type
- Freshwater and marine
Figures from the maker's published specifications. Makers revise products, so check the current figures before buying. Photos supplied by the brand or its distributor.
Compare with
Browse all uv & sterilisers
Oase · UV clarifier
ClearTronic
- Tank size
- up to 600 L
- UV lamp
- 7–11 W
Canister-filtered tanks prone to green water, or keepers who want an extra safeguard against outbreaks.
3 models
SunSun · UV clarifier
AUV UV-C Lamp
- Tank size
- up to 2600 L
- UV lamp
- 3–14 W
Tanks or sumps with green water or where you want to cut free-floating bacteria.
6 models
SunSun · UV clarifier
ZUV Timer UV-C Lamp
- Tank size
- up to 2600 L
- UV lamp
- 10–14 W
Large tanks and sumps with green water.
3 models
Frequently asked questions
Quick answers about the Eheim reeflexUV, drawn from its specs.
What size tank is the Eheim reeflexUV for?
The maker rates it by model: 350 up to 350 L, 500 up to 500 L, 800 up to 800 L.
Who is the Eheim reeflexUV best for?
Planted tanks prone to green water, or anyone wanting a bit of extra clarity and pathogen control.
Is there anything to watch out for with the Eheim reeflexUV?
It does nothing for algae growing on plants or glass, and the lamp needs replacing about once a year.
What are the alternatives to the Eheim reeflexUV?
Other uv & sterilisers worth comparing: Boyu Submersible UV Steriliser, Oase ClearTronic, SunSun AUV UV-C Lamp. Add any of them to the compare table to see the specs side by side.